finished and tuned prototyp constructor based implementation
finished and tuned prototyp constructor based implementation

  * slower than Utf8-Only for BigTable (3.9 vs 2.9 sec)
  * almost equally fast for attributes (4.17 vs 3.93 sec)

  => for real world loads the slowdown could be very OK, especially with
     respect to the gain in flexibility

FranklinChen/blaze-markup,dylex/blaze-markup,Soostone/blaze-html-haste,iblech/blaze-html,jgm/blaze-html,Soostone/blaze-markup-haste,mikehat/blaze-all,FranklinChen/blaze-markup,iblech/blaze-html,jgm/blaze-html,mikehat/blaze-all,jgm/blaze-html,dylex/blaze-markup,mikehat/blaze-all,Soostone/blaze-markup-haste